Bueng makkasan is a large lake that is located in the heart of Bangkok, where Thai national railway was dug. In the source to use as sewer 2474 (1931) and waste water as well as makkasan railway factory engine oil makes the bung makkasan shallow from the settling of the suspension to have the bung makkasan with slum communities including 3 729 households, most of which were all added up.And waste into the bung makkasan until birth The problem of environmental conditions degraded and polluted water has become a source of disease spores. His Majesty, he is aware of this kind of pollution condition of mixture is thanop. On April 15 and April 20, 2528 (1985) agencies jointly improve the bung makkasan to utilize to help drainage and alleviate its waste water in the Canal, Sam. Using the method of "natural water filtration" is using water hyacinth weed, which is available to serve as an impurity and absorbing toxins from polluted water sources and at the same time, they must regularly take water hyacinth from the Lake every 10 weeks to prevent water hyacinth has obscured the sunlight until reproductive will shine into the swamp.
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